They way we sleep

You all probably know or have met articles that say - '9 hours of sleep per night is...' or 'people who sleep less than x hours per night are/could/would...'.Well - sleeping 7-9 hours as whole is not so obvious and everlasting as we think.Here is a nice article that describes and explains what sleeping was alike some hundreds years ago.

What would you do between your sleeping sets? Read, smoke, pray, have sex or visit your neighbours? :)